In a class of 30 students, 6 students are left handed and 24 students are right handed. What is the ratio of left handed students to all students?

Is this part-to-part or part-to-whole?

This law is sometimes called the grouping property. as you can see, regardless of how the numbers are grouped, the answer is still 13. the associative law of multiplication is similar to the same law for addition. it says that no matter how you group numbers you are multiplying together, you will get the same answer.